scholarly journals An automatic wrapped phase gradient-based method for spherical aberration correction in Digital Holographic Microscopy

2018 ◽  
Vol 51 (3) ◽  
pp. 1-8
Author(s):  
A.C. Monaldi ◽  
G.G. Romero ◽  
A. V. Blanc ◽  
C. M. Cabrera
Keyword(s):  
Spherical Aberration ◽  
Digital Holographic Microscopy ◽  
Aberration Correction ◽  
Phase Gradient ◽  
Gradient Based ◽  
Holographic Microscopy

scholarly journals Latest Advances in Single and Multiwavelength Digital Holography and Holographic Microscopy

2020 ◽  
Author(s):  
George Nehmetallah ◽  
Logan Williams ◽  
Thanh Nguyen
Keyword(s):  
Digital Holography ◽  
Spherical Aberration ◽  
Reference Beam ◽  
Digital Holographic Microscopy ◽  
Reconstruction Algorithms ◽  
Post Processing ◽  
Transmission Modes ◽  
Multi Wavelength ◽  
Holographic Microscopy ◽  
Phase Curvature

In this Chapter, we discuss the latest advances in digital holography (DH) and digital holographic microscopy (DHM). Specifically, we study the different setup configurations such as single and multiwavelength approaches in reflection and transmission modes and the reconstruction algorithms used. We also propose two novel telecentric recording configurations for single and multi-wavelength digital holographic microscopy (TMW-DHM) systems. Brief theory and results are shown for each of the experimental setups discussed. The advantages and disadvantages of the different configurations will be studied in details. Typical configuration features are, ease of phase reconstruction, speed, vertical measurement range without phase ambiguity, difficulty in applying optical and numerical post-processing aberration compensation methods. Aberrations can be due to: (a) misalignment, (b) multiwavelength method resulting in Chromatic aberrations, (c) the MO resulting in parabolic phase curvature, (d) the angle of the reference beam resulting in linear phase distortions, and (e) different optical components used in the setup, such as spherical aberration, astigmatism, coma, and distortion. We conclude that telecentric configuration eliminates the need of extensive digital automatic aberration compensation or the need for a second hologram’s phase to be used to obtain the object phase map through subtraction. We also conclude that without a telecentric setup and even with post-processing a residual phase remains to perturb the measurement. Finally, a custom developed user-friendly graphical user interface (GUI) software is employed to automate the reconstruction processes for all configurations.

Antifouling mechanism of natural product-based coatings investigated by digital holographic microscopy

2021 ◽  
Vol 84 ◽  
pp. 200-207
Author(s):  
Jiansen Pan ◽  
Qingmei Peng ◽  
Guoliang Zhang ◽  
Qingyi Xie ◽  
Xiangjun Gong ◽  
...  
Keyword(s):  
Natural Product ◽  
Digital Holographic Microscopy ◽  
Holographic Microscopy

scholarly journals Dynamic Speckle Illumination Digital Holographic Microscopy by Doubly Scattered System

Photonics ◽  
2021 ◽  
Vol 8 (7) ◽  
pp. 276
Author(s):  
Yun Liu ◽  
Peihua Bu ◽  
Mingxing Jiao ◽  
Junhong Xing ◽  
Ke Kou ◽  
...  
Keyword(s):  
Time Correlation ◽  
Digital Holographic Microscopy ◽  
Laser Source ◽  
Speckle Reduction ◽  
Single Shot ◽  
Coherent Noise ◽  
Real Time Measurement ◽  
Dynamic Speckle ◽  
Holographic Microscopy ◽  
Speckle Suppression

The coherent noise always exists in digital holographic microscopy due to the laser source, degrading the image quality. A method of speckle suppression using the dynamic speckle illumination, produced by double-moving diffusers, is presented in digital holographic microscopy. The space–time correlation functions are theoretically analyzed from the statistics distribution in the doubly and singly scattered system, respectively. The configuration of double-moving diffusers is demonstrated to have better performance in speckle suppression compared with the single diffuser and moving-static double diffusers cases. The experiment results verify the feasibility of the approach. The presented approach only requires a single shot interferogram to realize the speckle reduction, accordingly it has the potential application in real-time measurement.

Sign in / Sign up

Export Citation Format

Share Document